Has the video been taken down by Facebook?

The social media giant said that it disabled Stephen's account within 23 minutes of receiving the first report about the video of the fatal shooting and two hours after receiving any report.

Justin Osofsky, Facebook's vice president of global operations, said: "In this case we did not receive a report about the first video, and we only received a report about the second video containing the shooting more than an hour and 45 minutes after it was posted.

"We received reports about the third video, containing the man's live confession, only after it had ended."

He added: "As a result of the terrible series of events, we are reviewing our reporting flows to be sure people can report videos and other material that violates our standards as easily and quickly as possible."

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